Digital BW, The Print

----- Original Message -----
From: "royvharrington" <roy@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Wednesday, April 03, 2002 7:57 PM
Subject: Re: [Digital BW] Thoughts about Imaging


(snip)
>
> Dynamic Range is a characterization how much bigger the maximum intensity
is
> from the minimum intensity of the system.  In sound that's the ratio of
the loudest
> to the quietest.  In an image that's the ratio of the brightest to the
darkest.
> Austin's ratio is of the high contrast to the lowest contrast.

Roy,

Ratio of minimum and maximum contrast. You have hit the nail on the head!
This fulfils the basic definition and is not as obtuse as it would appear
from the DyR equation. The equation is just a subtle change on the basic max
to min ratio but makes a great deal of sense in systems where noise is a
major factor in discriminating between signal levels. Austin is not wrong in
applying his contrast ratio to a photographic print but he has failed to
demonstrate how this would be done or what value it would have when
comparing two printing mediums.

Thanks,
Martin

(snip)